[ConservingFreedom]

Neither of the links you posted cites "examining death certificates and drawing conclusions" as a problem with the second-hand-smoke studies - nor even something those studies did at all.

[Nifster]

But if you had read any of the studies that were done about second hand smoke they were done that way. Just like the primary studies done on smoking. They scoured death certificates and even if a person had died of pneumonia or heart disease they were thrown into the smoking caused it category. You have to have been paying attention to the longitudinal studies